Power overlay in Settings.

chrome/browser/ui/webui/options/chromeos/power_handler.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_POWER_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_POWER_HANDLER_H_
+
+#include "ash/system/chromeos/power/power_status.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "chrome/browser/ui/webui/options/options_ui.h"
+
+namespace chromeos {
+namespace options {
+
+// Shows battery status and power settings.
+class PowerHandler : public ::options::OptionsPageUIHandler,
+                     public ash::PowerStatus::Observer {
+ public:
+  PowerHandler();
+  ~PowerHandler() override;
+
+  // OptionsPageUIHandler implementation.
+  void GetLocalizedValues(base::DictionaryValue* localized_strings) override;
+  void InitializePage() override;
+  void RegisterMessages() override;
+
+  // ash::PowerStatus::Observer implementation.
+  void OnPowerStatusChanged() override;
+
+private:
+  // Gets the battery status text, showing the percentage and time remaining if
+  // calculated. Returns an empty string if there is no battery.
+  base::string16 GetStatusValue() const;
+
+  // Helper function to get the battery status text, including the 'Battery'
+  // label at the beginning. Wraps GetStatusValue(). Returns an empty string if
+  // there is no battery.
+  base::string16 GetFullStatusText() const;
+
+  // Handler for the battery icon request.
+  void GetBatteryIcon(const base::ListValue* args);
+
+  DISALLOW_COPY_AND_ASSIGN(PowerHandler);
+};
+
+}  // namespace options
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_POWER_HANDLER_H_